argLine getting overridden by parent pom and vault-core pom

I was trying to calculate code coverage for jackrabbit vault repo using jacoco agent (https://github.com/apache/jackrabbit-filevault/)

Not able to install jacoco via cli as the argLine is getting overridden by the parent pom and core pom. argLine needs to be appended rather than overridden.

vault-core/pom.xml <argLine>-Doak=true -Xmx1024m</argLine>

parent/pom.xml <argLine>${test.vm.options}</argLine>